Will mark brainlest! plz answer fast i need this due in 2 minutes plz plz plz hurry which is true? a) an equation never has parentheses. b) an expression never has parentheses. c) an expression does not have an equal sign. d) sometimes an equation does not have an equal sign.

C

Step-by-step explanation:

Example 3x+5c is an expression

Example 3x+5x=8x

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places